Based on the part number **FRTD-R-A2-R**, this component is a specific configuration of a **Resistance Temperature Detector (RTD)** sensor, typically used in industrial automation for precision temperature measurement. Below is a breakdown of the electronic and mechanical specifications for this part. --- ### 1. Part Number Deciphering (Typical Industry Standard) | Segment | Meaning | Technical Description | | :--- | :--- | :--- | | **FRTD** | Series | Flexible/Fixed Resistance Temperature Detector. | | **R** | Element Type | Standard **Platinum (Pt)** resistance wire. | | **A2** | Accuracy Class | Usually refers to **Class A** (±0.15°C at 0°C). | | **R** | Configuration | Refers to the lead wire type or housing (often "Ribbon" or "Right-angle"). | --- ### 2. Electronic Specifications The core of this device is a Platinum resistor. Its behavior is defined by the following characteristics: * **Resistance at 0°C:** Typically **100 Ohms** (Pt100) or **1000 Ohms** (Pt1000). * **Temperature Coefficient (Alpha):** Standard 0.00385 $\Omega/\Omega/°C$. * **Wiring Configuration:** Usually 2-wire, 3-wire, or 4-wire. * *3-wire* is the most common for this series to compensate for lead wire resistance. * **Measurement Range:** Generally covers **-50°C to +250°C** (depending on the insulation material). --- ### 3. Key Electronic Components The assembly consists of three primary electronic sections: #### A. Sensing Element A thin-film or wire-wound platinum resistor. As temperature increases, the electrical resistance increases in a highly linear and predictable manner. #### B. Insulation & Protection Because these parts are often used in "R" (Ribbon) or "A2" (Specific Housing) formats: * **Dielectric Strength:** Usually tested up to 500V DC. * **Insulation Resistance:** $>100 M\Omega$ at room temperature. #### C. Termination The "R" suffix often indicates the terminal type, such as: * Bare lead wires. * Spade lugs. * Specific connector headers for PCB mounting. --- ### 4. Comparison: RTD vs. Thermocouple | Feature | FRTD-R-A2-R (RTD) | Thermocouple | | :--- | :--- | :--- | | **Accuracy** | Very High (Class A) | Standard | | **Stability** | Excellent (years of use) | Drifts over time | | **Sensitivity** | High | Low | | **Power Req.** | Requires excitation current | Self-powered | --- ### 5. Application Circuit Example To read the signal from this sensor, a **Wheatstone Bridge** or a **Constant Current Source** is required. ```cpp // Logic for reading an RTD via an ADC (Conceptual) float calculateTemp(float resistance) { float R0 = 100.0; // Resistance at 0 degrees float alpha = 0.00385; return (resistance - R0) / (R0 * alpha); } ```